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lwip/src/api/api_msg.c

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/**
* @file
* Sequential API Internal module
*
*/
/*
* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* This file is part of the lwIP TCP/IP stack.
*
* Author: Adam Dunkels <adam@sics.se>
*
*/
#include "lwip/opt.h"
#if LWIP_NETCONN /* don't build if not configured for use in lwipopts.h */
#include "lwip/api_msg.h"
#include "lwip/ip.h"
#include "lwip/udp.h"
#include "lwip/tcp.h"
#include "lwip/raw.h"
#include "lwip/memp.h"
#include "lwip/tcpip.h"
#include "lwip/igmp.h"
#include "lwip/dns.h"
#include "lwip/mld6.h"
#include <string.h>
#define SET_NONBLOCKING_CONNECT(conn, val) do { if(val) { \
(conn)->flags |= NETCONN_FLAG_IN_NONBLOCKING_CONNECT; \
} else { \
(conn)->flags &= ~ NETCONN_FLAG_IN_NONBLOCKING_CONNECT; }} while(0)
#define IN_NONBLOCKING_CONNECT(conn) (((conn)->flags & NETCONN_FLAG_IN_NONBLOCKING_CONNECT) != 0)
/* forward declarations */
#if LWIP_TCP
static err_t lwip_netconn_do_writemore(struct netconn *conn);
static void lwip_netconn_do_close_internal(struct netconn *conn);
#endif
#if LWIP_RAW
/**
* Receive callback function for RAW netconns.
* Doesn't 'eat' the packet, only references it and sends it to
* conn->recvmbox
*
* @see raw.h (struct raw_pcb.recv) for parameters and return value
*/
static u8_t
recv_raw(void *arg, struct raw_pcb *pcb, struct pbuf *p,
ip_addr_t *addr)
{
struct pbuf *q;
struct netbuf *buf;
struct netconn *conn;
LWIP_UNUSED_ARG(addr);
conn = (struct netconn *)arg;
if ((conn != NULL) && sys_mbox_valid(&conn->recvmbox)) {
#if LWIP_SO_RCVBUF
int recv_avail;
SYS_ARCH_GET(conn->recv_avail, recv_avail);
if ((recv_avail + (int)(p->tot_len)) > conn->recv_bufsize) {
return 0;
}
#endif /* LWIP_SO_RCVBUF */
/* copy the whole packet into new pbufs */
q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
if(q != NULL) {
if (pbuf_copy(q, p) != ERR_OK) {
pbuf_free(q);
q = NULL;
}
}
if (q != NULL) {
u16_t len;
buf = (struct netbuf *)memp_malloc(MEMP_NETBUF);
if (buf == NULL) {
pbuf_free(q);
return 0;
}
buf->p = q;
buf->ptr = q;
ipX_addr_copy(PCB_ISIPV6(pcb), buf->addr, *ipX_current_src_addr());
buf->port = pcb->protocol;
len = q->tot_len;
if (sys_mbox_trypost(&conn->recvmbox, buf) != ERR_OK) {
netbuf_delete(buf);
return 0;
} else {
#if LWIP_SO_RCVBUF
SYS_ARCH_INC(conn->recv_avail, len);
#endif /* LWIP_SO_RCVBUF */
/* Register event with callback */
API_EVENT(conn, NETCONN_EVT_RCVPLUS, len);
}
}
}
return 0; /* do not eat the packet */
}
#endif /* LWIP_RAW*/
#if LWIP_UDP
/**
* Receive callback function for UDP netconns.
* Posts the packet to conn->recvmbox or deletes it on memory error.
*
* @see udp.h (struct udp_pcb.recv) for parameters
*/
static void
recv_udp(void *arg, struct udp_pcb *pcb, struct pbuf *p,
ip_addr_t *addr, u16_t port)
{
struct netbuf *buf;
struct netconn *conn;
u16_t len;
#if LWIP_SO_RCVBUF
int recv_avail;
#endif /* LWIP_SO_RCVBUF */
LWIP_UNUSED_ARG(pcb); /* only used for asserts... */
LWIP_ASSERT("recv_udp must have a pcb argument", pcb != NULL);
LWIP_ASSERT("recv_udp must have an argument", arg != NULL);
conn = (struct netconn *)arg;
LWIP_ASSERT("recv_udp: recv for wrong pcb!", conn->pcb.udp == pcb);
#if LWIP_SO_RCVBUF
SYS_ARCH_GET(conn->recv_avail, recv_avail);
if ((conn == NULL) || !sys_mbox_valid(&conn->recvmbox) ||
((recv_avail + (int)(p->tot_len)) > conn->recv_bufsize)) {
#else /* LWIP_SO_RCVBUF */
if ((conn == NULL) || !sys_mbox_valid(&conn->recvmbox)) {
#endif /* LWIP_SO_RCVBUF */
pbuf_free(p);
return;
}
buf = (struct netbuf *)memp_malloc(MEMP_NETBUF);
if (buf == NULL) {
pbuf_free(p);
return;
} else {
buf->p = p;
buf->ptr = p;
ipX_addr_set_ipaddr(ip_current_is_v6(), &buf->addr, addr);
buf->port = port;
#if LWIP_NETBUF_RECVINFO
{
/* get the UDP header - always in the first pbuf, ensured by udp_input */
const struct udp_hdr* udphdr = ipX_next_header_ptr();
#if LWIP_CHECKSUM_ON_COPY
buf->flags = NETBUF_FLAG_DESTADDR;
#endif /* LWIP_CHECKSUM_ON_COPY */
ipX_addr_set(ip_current_is_v6(), &buf->toaddr, ipX_current_dest_addr());
buf->toport_chksum = udphdr->dest;
}
#endif /* LWIP_NETBUF_RECVINFO */
}
len = p->tot_len;
if (sys_mbox_trypost(&conn->recvmbox, buf) != ERR_OK) {
netbuf_delete(buf);
return;
} else {
#if LWIP_SO_RCVBUF
SYS_ARCH_INC(conn->recv_avail, len);
#endif /* LWIP_SO_RCVBUF */
/* Register event with callback */
API_EVENT(conn, NETCONN_EVT_RCVPLUS, len);
}
}
#endif /* LWIP_UDP */
#if LWIP_TCP
/**
* Receive callback function for TCP netconns.
* Posts the packet to conn->recvmbox, but doesn't delete it on errors.
*
* @see tcp.h (struct tcp_pcb.recv) for parameters and return value
*/
static err_t
recv_tcp(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
{
struct netconn *conn;
u16_t len;
LWIP_UNUSED_ARG(pcb);
LWIP_ASSERT("recv_tcp must have a pcb argument", pcb != NULL);
LWIP_ASSERT("recv_tcp must have an argument", arg != NULL);
conn = (struct netconn *)arg;
if (conn == NULL) {
return ERR_VAL;
}
LWIP_ASSERT("recv_tcp: recv for wrong pcb!", conn->pcb.tcp == pcb);
if (!sys_mbox_valid(&conn->recvmbox)) {
/* recvmbox already deleted */
if (p != NULL) {
tcp_recved(pcb, p->tot_len);
pbuf_free(p);
}
return ERR_OK;
}
/* Unlike for UDP or RAW pcbs, don't check for available space
using recv_avail since that could break the connection
(data is already ACKed) */
/* don't overwrite fatal errors! */
NETCONN_SET_SAFE_ERR(conn, err);
if (p != NULL) {
len = p->tot_len;
} else {
len = 0;
}
if (sys_mbox_trypost(&conn->recvmbox, p) != ERR_OK) {
/* don't deallocate p: it is presented to us later again from tcp_fasttmr! */
return ERR_MEM;
} else {
#if LWIP_SO_RCVBUF
SYS_ARCH_INC(conn->recv_avail, len);
#endif /* LWIP_SO_RCVBUF */
/* Register event with callback */
API_EVENT(conn, NETCONN_EVT_RCVPLUS, len);
}
return ERR_OK;
}
/**
* Poll callback function for TCP netconns.
* Wakes up an application thread that waits for a connection to close
* or data to be sent. The application thread then takes the
* appropriate action to go on.
*
* Signals the conn->sem.
* netconn_close waits for conn->sem if closing failed.
*
* @see tcp.h (struct tcp_pcb.poll) for parameters and return value
*/
static err_t
poll_tcp(void *arg, struct tcp_pcb *pcb)
{
struct netconn *conn = (struct netconn *)arg;
LWIP_UNUSED_ARG(pcb);
LWIP_ASSERT("conn != NULL", (conn != NULL));
if (conn->state == NETCONN_WRITE) {
lwip_netconn_do_writemore(conn);
} else if (conn->state == NETCONN_CLOSE) {
lwip_netconn_do_close_internal(conn);
}
/* @todo: implement connect timeout here? */
/* Did a nonblocking write fail before? Then check available write-space. */
if (conn->flags & NETCONN_FLAG_CHECK_WRITESPACE) {
/* If the queued byte- or pbuf-count drops below the configured low-water limit,
let select mark this pcb as writable again. */
if ((conn->pcb.tcp != NULL) && (tcp_sndbuf(conn->pcb.tcp) > TCP_SNDLOWAT) &&
(tcp_sndqueuelen(conn->pcb.tcp) < TCP_SNDQUEUELOWAT)) {
conn->flags &= ~NETCONN_FLAG_CHECK_WRITESPACE;
API_EVENT(conn, NETCONN_EVT_SENDPLUS, 0);
}
}
return ERR_OK;
}
/**
* Sent callback function for TCP netconns.
* Signals the conn->sem and calls API_EVENT.
* netconn_write waits for conn->sem if send buffer is low.
*
* @see tcp.h (struct tcp_pcb.sent) for parameters and return value
*/
static err_t
sent_tcp(void *arg, struct tcp_pcb *pcb, u16_t len)
{
struct netconn *conn = (struct netconn *)arg;
LWIP_UNUSED_ARG(pcb);
LWIP_ASSERT("conn != NULL", (conn != NULL));
if (conn->state == NETCONN_WRITE) {
lwip_netconn_do_writemore(conn);
} else if (conn->state == NETCONN_CLOSE) {
lwip_netconn_do_close_internal(conn);
}
if (conn) {
/* If the queued byte- or pbuf-count drops below the configured low-water limit,
let select mark this pcb as writable again. */
if ((conn->pcb.tcp != NULL) && (tcp_sndbuf(conn->pcb.tcp) > TCP_SNDLOWAT) &&
(tcp_sndqueuelen(conn->pcb.tcp) < TCP_SNDQUEUELOWAT)) {
conn->flags &= ~NETCONN_FLAG_CHECK_WRITESPACE;
API_EVENT(conn, NETCONN_EVT_SENDPLUS, len);
}
}
return ERR_OK;
}
/**
* Error callback function for TCP netconns.
* Signals conn->sem, posts to all conn mboxes and calls API_EVENT.
* The application thread has then to decide what to do.
*
* @see tcp.h (struct tcp_pcb.err) for parameters
*/
static void
err_tcp(void *arg, err_t err)
{
struct netconn *conn;
enum netconn_state old_state;
SYS_ARCH_DECL_PROTECT(lev);
conn = (struct netconn *)arg;
LWIP_ASSERT("conn != NULL", (conn != NULL));
conn->pcb.tcp = NULL;
/* no check since this is always fatal! */
SYS_ARCH_PROTECT(lev);
conn->last_err = err;
SYS_ARCH_UNPROTECT(lev);
/* reset conn->state now before waking up other threads */
old_state = conn->state;
conn->state = NETCONN_NONE;
/* Notify the user layer about a connection error. Used to signal
select. */
API_EVENT(conn, NETCONN_EVT_ERROR, 0);
/* Try to release selects pending on 'read' or 'write', too.
They will get an error if they actually try to read or write. */
API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
API_EVENT(conn, NETCONN_EVT_SENDPLUS, 0);
/* pass NULL-message to recvmbox to wake up pending recv */
if (sys_mbox_valid(&conn->recvmbox)) {
/* use trypost to prevent deadlock */
sys_mbox_trypost(&conn->recvmbox, NULL);
}
/* pass NULL-message to acceptmbox to wake up pending accept */
if (sys_mbox_valid(&conn->acceptmbox)) {
/* use trypost to preven deadlock */
sys_mbox_trypost(&conn->acceptmbox, NULL);
}
if ((old_state == NETCONN_WRITE) || (old_state == NETCONN_CLOSE) ||
(old_state == NETCONN_CONNECT)) {
/* calling lwip_netconn_do_writemore/lwip_netconn_do_close_internal is not necessary
since the pcb has already been deleted! */
int was_nonblocking_connect = IN_NONBLOCKING_CONNECT(conn);
SET_NONBLOCKING_CONNECT(conn, 0);
if (!was_nonblocking_connect) {
/* set error return code */
LWIP_ASSERT("conn->current_msg != NULL", conn->current_msg != NULL);
conn->current_msg->err = err;
conn->current_msg = NULL;
/* wake up the waiting task */
sys_sem_signal(&conn->op_completed);
}
} else {
LWIP_ASSERT("conn->current_msg == NULL", conn->current_msg == NULL);
}
}
/**
* Setup a tcp_pcb with the correct callback function pointers
* and their arguments.
*
* @param conn the TCP netconn to setup
*/
static void
setup_tcp(struct netconn *conn)
{
struct tcp_pcb *pcb;
pcb = conn->pcb.tcp;
tcp_arg(pcb, conn);
tcp_recv(pcb, recv_tcp);
tcp_sent(pcb, sent_tcp);
tcp_poll(pcb, poll_tcp, 4);
tcp_err(pcb, err_tcp);
}
/**
* Accept callback function for TCP netconns.
* Allocates a new netconn and posts that to conn->acceptmbox.
*
* @see tcp.h (struct tcp_pcb_listen.accept) for parameters and return value
*/
static err_t
accept_function(void *arg, struct tcp_pcb *newpcb, err_t err)
{
struct netconn *newconn;
struct netconn *conn = (struct netconn *)arg;
LWIP_DEBUGF(API_MSG_DEBUG, ("accept_function: newpcb->tate: %s\n", tcp_debug_state_str(newpcb->state)));
if (!sys_mbox_valid(&conn->acceptmbox)) {
LWIP_DEBUGF(API_MSG_DEBUG, ("accept_function: acceptmbox already deleted\n"));
return ERR_VAL;
}
/* We have to set the callback here even though
* the new socket is unknown. conn->socket is marked as -1. */
newconn = netconn_alloc(conn->type, conn->callback);
if (newconn == NULL) {
return ERR_MEM;
}
newconn->pcb.tcp = newpcb;
setup_tcp(newconn);
/* no protection: when creating the pcb, the netconn is not yet known
to the application thread */
newconn->last_err = err;
if (sys_mbox_trypost(&conn->acceptmbox, newconn) != ERR_OK) {
/* When returning != ERR_OK, the pcb is aborted in tcp_process(),
so do nothing here! */
/* remove all references to this netconn from the pcb */
struct tcp_pcb* pcb = newconn->pcb.tcp;
tcp_arg(pcb, NULL);
tcp_recv(pcb, NULL);
tcp_sent(pcb, NULL);
tcp_poll(pcb, NULL, 4);
tcp_err(pcb, NULL);
/* remove reference from to the pcb from this netconn */
newconn->pcb.tcp = NULL;
/* no need to drain since we know the recvmbox is empty. */
sys_mbox_free(&newconn->recvmbox);
sys_mbox_set_invalid(&newconn->recvmbox);
netconn_free(newconn);
return ERR_MEM;
} else {
/* Register event with callback */
API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
}
return ERR_OK;
}
#endif /* LWIP_TCP */
/**
* Create a new pcb of a specific type.
* Called from lwip_netconn_do_newconn().
*
* @param msg the api_msg_msg describing the connection type
* @return msg->conn->err, but the return value is currently ignored
*/
static void
pcb_new(struct api_msg_msg *msg)
{
LWIP_ASSERT("pcb_new: pcb already allocated", msg->conn->pcb.tcp == NULL);
/* Allocate a PCB for this connection */
switch(NETCONNTYPE_GROUP(msg->conn->type)) {
#if LWIP_RAW
case NETCONN_RAW:
msg->conn->pcb.raw = raw_new(msg->msg.n.proto);
if(msg->conn->pcb.raw != NULL) {
raw_recv(msg->conn->pcb.raw, recv_raw, msg->conn);
}
break;
#endif /* LWIP_RAW */
#if LWIP_UDP
case NETCONN_UDP:
msg->conn->pcb.udp = udp_new();
if(msg->conn->pcb.udp != NULL) {
#if LWIP_UDPLITE
if (NETCONNTYPE_ISUDPLITE(msg->conn->type)) {
udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_UDPLITE);
}
#endif /* LWIP_UDPLITE */
if (NETCONNTYPE_ISUDPNOCHKSUM(msg->conn->type)) {
udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_NOCHKSUM);
}
udp_recv(msg->conn->pcb.udp, recv_udp, msg->conn);
}
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case NETCONN_TCP:
msg->conn->pcb.tcp = tcp_new();
if(msg->conn->pcb.tcp != NULL) {
setup_tcp(msg->conn);
}
break;
#endif /* LWIP_TCP */
default:
/* Unsupported netconn type, e.g. protocol disabled */
msg->err = ERR_VAL;
return;
}
if (msg->conn->pcb.ip == NULL) {
msg->err = ERR_MEM;
}
#if LWIP_IPV6
else {
if (NETCONNTYPE_ISIPV6(msg->conn->type)) {
ip_set_v6(msg->conn->pcb.ip, 1);
}
}
#endif /* LWIP_IPV6 */
}
/**
* Create a new pcb of a specific type inside a netconn.
* Called from netconn_new_with_proto_and_callback.
*
* @param msg the api_msg_msg describing the connection type
*/
void
lwip_netconn_do_newconn(struct api_msg_msg *msg)
{
msg->err = ERR_OK;
if(msg->conn->pcb.tcp == NULL) {
pcb_new(msg);
}
/* Else? This "new" connection already has a PCB allocated. */
/* Is this an error condition? Should it be deleted? */
/* We currently just are happy and return. */
TCPIP_APIMSG_ACK(msg);
}
/**
* Create a new netconn (of a specific type) that has a callback function.
* The corresponding pcb is NOT created!
*
* @param t the type of 'connection' to create (@see enum netconn_type)
* @param proto the IP protocol for RAW IP pcbs
* @param callback a function to call on status changes (RX available, TX'ed)
* @return a newly allocated struct netconn or
* NULL on memory error
*/
struct netconn*
netconn_alloc(enum netconn_type t, netconn_callback callback)
{
struct netconn *conn;
int size;
conn = (struct netconn *)memp_malloc(MEMP_NETCONN);
if (conn == NULL) {
return NULL;
}
conn->last_err = ERR_OK;
conn->type = t;
conn->pcb.tcp = NULL;
/* If all sizes are the same, every compiler should optimize this switch to nothing, */
switch(NETCONNTYPE_GROUP(t)) {
#if LWIP_RAW
case NETCONN_RAW:
size = DEFAULT_RAW_RECVMBOX_SIZE;
break;
#endif /* LWIP_RAW */
#if LWIP_UDP
case NETCONN_UDP:
size = DEFAULT_UDP_RECVMBOX_SIZE;
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case NETCONN_TCP:
size = DEFAULT_TCP_RECVMBOX_SIZE;
break;
#endif /* LWIP_TCP */
default:
LWIP_ASSERT("netconn_alloc: undefined netconn_type", 0);
goto free_and_return;
}
if (sys_sem_new(&conn->op_completed, 0) != ERR_OK) {
goto free_and_return;
}
if (sys_mbox_new(&conn->recvmbox, size) != ERR_OK) {
sys_sem_free(&conn->op_completed);
goto free_and_return;
}
#if LWIP_TCP
sys_mbox_set_invalid(&conn->acceptmbox);
#endif
conn->state = NETCONN_NONE;
#if LWIP_SOCKET
/* initialize socket to -1 since 0 is a valid socket */
conn->socket = -1;
#endif /* LWIP_SOCKET */
conn->callback = callback;
#if LWIP_TCP
conn->current_msg = NULL;
conn->write_offset = 0;
#endif /* LWIP_TCP */
#if LWIP_SO_SNDTIMEO
conn->send_timeout = 0;
#endif /* LWIP_SO_SNDTIMEO */
#if LWIP_SO_RCVTIMEO
conn->recv_timeout = 0;
#endif /* LWIP_SO_RCVTIMEO */
#if LWIP_SO_RCVBUF
conn->recv_bufsize = RECV_BUFSIZE_DEFAULT;
conn->recv_avail = 0;
#endif /* LWIP_SO_RCVBUF */
conn->flags = 0;
return conn;
free_and_return:
memp_free(MEMP_NETCONN, conn);
return NULL;
}
/**
* Delete a netconn and all its resources.
* The pcb is NOT freed (since we might not be in the right thread context do this).
*
* @param conn the netconn to free
*/
void
netconn_free(struct netconn *conn)
{
LWIP_ASSERT("PCB must be deallocated outside this function", conn->pcb.tcp == NULL);
LWIP_ASSERT("recvmbox must be deallocated before calling this function",
!sys_mbox_valid(&conn->recvmbox));
#if LWIP_TCP
LWIP_ASSERT("acceptmbox must be deallocated before calling this function",
!sys_mbox_valid(&conn->acceptmbox));
#endif /* LWIP_TCP */
sys_sem_free(&conn->op_completed);
sys_sem_set_invalid(&conn->op_completed);
memp_free(MEMP_NETCONN, conn);
}
/**
* Delete rcvmbox and acceptmbox of a netconn and free the left-over data in
* these mboxes
*
* @param conn the netconn to free
* @bytes_drained bytes drained from recvmbox
* @accepts_drained pending connections drained from acceptmbox
*/
static void
netconn_drain(struct netconn *conn)
{
void *mem;
#if LWIP_TCP
struct pbuf *p;
#endif /* LWIP_TCP */
/* This runs in tcpip_thread, so we don't need to lock against rx packets */
/* Delete and drain the recvmbox. */
if (sys_mbox_valid(&conn->recvmbox)) {
while (sys_mbox_tryfetch(&conn->recvmbox, &mem) != SYS_MBOX_EMPTY) {
#if LWIP_TCP
if (NETCONNTYPE_GROUP(conn->type) == NETCONN_TCP) {
if(mem != NULL) {
p = (struct pbuf*)mem;
/* pcb might be set to NULL already by err_tcp() */
if (conn->pcb.tcp != NULL) {
tcp_recved(conn->pcb.tcp, p->tot_len);
}
pbuf_free(p);
}
} else
#endif /* LWIP_TCP */
{
netbuf_delete((struct netbuf *)mem);
}
}
sys_mbox_free(&conn->recvmbox);
sys_mbox_set_invalid(&conn->recvmbox);
}
/* Delete and drain the acceptmbox. */
#if LWIP_TCP
if (sys_mbox_valid(&conn->acceptmbox)) {
while (sys_mbox_tryfetch(&conn->acceptmbox, &mem) != SYS_MBOX_EMPTY) {
struct netconn *newconn = (struct netconn *)mem;
/* Only tcp pcbs have an acceptmbox, so no need to check conn->type */
/* pcb might be set to NULL already by err_tcp() */
if (conn->pcb.tcp != NULL) {
tcp_accepted(conn->pcb.tcp);
}
/* drain recvmbox */
netconn_drain(newconn);
if (newconn->pcb.tcp != NULL) {
tcp_abort(newconn->pcb.tcp);
newconn->pcb.tcp = NULL;
}
netconn_free(newconn);
}
sys_mbox_free(&conn->acceptmbox);
sys_mbox_set_invalid(&conn->acceptmbox);
}
#endif /* LWIP_TCP */
}
#if LWIP_TCP
/**
* Internal helper function to close a TCP netconn: since this sometimes
* doesn't work at the first attempt, this function is called from multiple
* places.
*
* @param conn the TCP netconn to close
*/
static void
lwip_netconn_do_close_internal(struct netconn *conn)
{
err_t err;
u8_t shut, shut_rx, shut_tx, close;
LWIP_ASSERT("invalid conn", (conn != NULL));
LWIP_ASSERT("this is for tcp netconns only", (NETCONNTYPE_GROUP(conn->type) == NETCONN_TCP));
LWIP_ASSERT("conn must be in state NETCONN_CLOSE", (conn->state == NETCONN_CLOSE));
LWIP_ASSERT("pcb already closed", (conn->pcb.tcp != NULL));
LWIP_ASSERT("conn->current_msg != NULL", conn->current_msg != NULL);
shut = conn->current_msg->msg.sd.shut;
shut_rx = shut & NETCONN_SHUT_RD;
shut_tx = shut & NETCONN_SHUT_WR;
/* shutting down both ends is the same as closing */
close = shut == NETCONN_SHUT_RDWR;
/* Set back some callback pointers */
if (close) {
tcp_arg(conn->pcb.tcp, NULL);
}
if (conn->pcb.tcp->state == LISTEN) {
tcp_accept(conn->pcb.tcp, NULL);
} else {
/* some callbacks have to be reset if tcp_close is not successful */
if (shut_rx) {
tcp_recv(conn->pcb.tcp, NULL);
tcp_accept(conn->pcb.tcp, NULL);
}
if (shut_tx) {
tcp_sent(conn->pcb.tcp, NULL);
}
if (close) {
tcp_poll(conn->pcb.tcp, NULL, 4);
tcp_err(conn->pcb.tcp, NULL);
}
}
/* Try to close the connection */
if (close) {
err = tcp_close(conn->pcb.tcp);
} else {
err = tcp_shutdown(conn->pcb.tcp, shut_rx, shut_tx);
}
if (err == ERR_OK) {
/* Closing succeeded */
conn->current_msg->err = ERR_OK;
conn->current_msg = NULL;
conn->state = NETCONN_NONE;
if (close) {
/* Set back some callback pointers as conn is going away */
conn->pcb.tcp = NULL;
/* Trigger select() in socket layer. Make sure everybody notices activity
on the connection, error first! */
API_EVENT(conn, NETCONN_EVT_ERROR, 0);
}
if (shut_rx) {
API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
}
if (shut_tx) {
API_EVENT(conn, NETCONN_EVT_SENDPLUS, 0);
}
/* wake up the application task */
sys_sem_signal(&conn->op_completed);
} else {
/* Closing failed, restore some of the callbacks */
/* Closing of listen pcb will never fail! */
LWIP_ASSERT("Closing a listen pcb may not fail!", (conn->pcb.tcp->state != LISTEN));
tcp_sent(conn->pcb.tcp, sent_tcp);
tcp_poll(conn->pcb.tcp, poll_tcp, 4);
tcp_err(conn->pcb.tcp, err_tcp);
tcp_arg(conn->pcb.tcp, conn);
/* don't restore recv callback: we don't want to receive any more data */
}
/* If closing didn't succeed, we get called again either
from poll_tcp or from sent_tcp */
}
#endif /* LWIP_TCP */
/**
* Delete the pcb inside a netconn.
* Called from netconn_delete.
*
* @param msg the api_msg_msg pointing to the connection
*/
void
lwip_netconn_do_delconn(struct api_msg_msg *msg)
{
/* @todo TCP: abort running write/connect? */
if ((msg->conn->state != NETCONN_NONE) &&
(msg->conn->state != NETCONN_LISTEN) &&
(msg->conn->state != NETCONN_CONNECT)) {
/* this only happens for TCP netconns */
LWIP_ASSERT("NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_TCP",
NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_TCP);
msg->err = ERR_INPROGRESS;
} else {
LWIP_ASSERT("blocking connect in progress",
(msg->conn->state != NETCONN_CONNECT) || IN_NONBLOCKING_CONNECT(msg->conn));
/* Drain and delete mboxes */
netconn_drain(msg->conn);
if (msg->conn->pcb.tcp != NULL) {
switch (NETCONNTYPE_GROUP(msg->conn->type)) {
#if LWIP_RAW
case NETCONN_RAW:
raw_remove(msg->conn->pcb.raw);
break;
#endif /* LWIP_RAW */
#if LWIP_UDP
case NETCONN_UDP:
msg->conn->pcb.udp->recv_arg = NULL;
udp_remove(msg->conn->pcb.udp);
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case NETCONN_TCP:
LWIP_ASSERT("already writing or closing", msg->conn->current_msg == NULL &&
msg->conn->write_offset == 0);
msg->conn->state = NETCONN_CLOSE;
msg->msg.sd.shut = NETCONN_SHUT_RDWR;
msg->conn->current_msg = msg;
lwip_netconn_do_close_internal(msg->conn);
/* API_EVENT is called inside lwip_netconn_do_close_internal, before releasing
the application thread, so we can return at this point! */
return;
#endif /* LWIP_TCP */
default:
break;
}
msg->conn->pcb.tcp = NULL;
}
/* tcp netconns don't come here! */
/* @todo: this lets select make the socket readable and writable,
which is wrong! errfd instead? */
API_EVENT(msg->conn, NETCONN_EVT_RCVPLUS, 0);
API_EVENT(msg->conn, NETCONN_EVT_SENDPLUS, 0);
}
if (sys_sem_valid(&msg->conn->op_completed)) {
sys_sem_signal(&msg->conn->op_completed);
}
}
/**
* Bind a pcb contained in a netconn
* Called from netconn_bind.
*
* @param msg the api_msg_msg pointing to the connection and containing
* the IP address and port to bind to
*/
void
lwip_netconn_do_bind(struct api_msg_msg *msg)
{
if (ERR_IS_FATAL(msg->conn->last_err)) {
msg->err = msg->conn->last_err;
} else {
msg->err = ERR_VAL;
if (msg->conn->pcb.tcp != NULL) {
switch (NETCONNTYPE_GROUP(msg->conn->type)) {
#if LWIP_RAW
case NETCONN_RAW:
msg->err = raw_bind(msg->conn->pcb.raw, API_EXPR_REF(msg->msg.bc.ipaddr));
break;
#endif /* LWIP_RAW */
#if LWIP_UDP
case NETCONN_UDP:
msg->err = udp_bind(msg->conn->pcb.udp, API_EXPR_REF(msg->msg.bc.ipaddr), msg->msg.bc.port);
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case NETCONN_TCP:
msg->err = tcp_bind(msg->conn->pcb.tcp, API_EXPR_REF(msg->msg.bc.ipaddr), msg->msg.bc.port);
break;
#endif /* LWIP_TCP */
default:
break;
}
}
}
TCPIP_APIMSG_ACK(msg);
}
#if LWIP_TCP
/**
* TCP callback function if a connection (opened by tcp_connect/lwip_netconn_do_connect) has
* been established (or reset by the remote host).
*
* @see tcp.h (struct tcp_pcb.connected) for parameters and return values
*/
static err_t
lwip_netconn_do_connected(void *arg, struct tcp_pcb *pcb, err_t err)
{
struct netconn *conn;
int was_blocking;
LWIP_UNUSED_ARG(pcb);
conn = (struct netconn *)arg;
if (conn == NULL) {
return ERR_VAL;
}
LWIP_ASSERT("conn->state == NETCONN_CONNECT", conn->state == NETCONN_CONNECT);
LWIP_ASSERT("(conn->current_msg != NULL) || conn->in_non_blocking_connect",
(conn->current_msg != NULL) || IN_NONBLOCKING_CONNECT(conn));
if (conn->current_msg != NULL) {
conn->current_msg->err = err;
}
if ((NETCONNTYPE_GROUP(conn->type) == NETCONN_TCP) && (err == ERR_OK)) {
setup_tcp(conn);
}
was_blocking = !IN_NONBLOCKING_CONNECT(conn);
SET_NONBLOCKING_CONNECT(conn, 0);
conn->current_msg = NULL;
conn->state = NETCONN_NONE;
if (!was_blocking) {
NETCONN_SET_SAFE_ERR(conn, ERR_OK);
}
API_EVENT(conn, NETCONN_EVT_SENDPLUS, 0);
if (was_blocking) {
sys_sem_signal(&conn->op_completed);
}
return ERR_OK;
}
#endif /* LWIP_TCP */
/**
* Connect a pcb contained inside a netconn
* Called from netconn_connect.
*
* @param msg the api_msg_msg pointing to the connection and containing
* the IP address and port to connect to
*/
void
lwip_netconn_do_connect(struct api_msg_msg *msg)
{
if (msg->conn->pcb.tcp == NULL) {
/* This may happen when calling netconn_connect() a second time */
msg->err = ERR_CLSD;
if (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_TCP) {
/* For TCP, netconn_connect() calls tcpip_apimsg(), so signal op_completed here. */
sys_sem_signal(&msg->conn->op_completed);
return;
}
} else {
switch (NETCONNTYPE_GROUP(msg->conn->type)) {
#if LWIP_RAW
case NETCONN_RAW:
msg->err = raw_connect(msg->conn->pcb.raw, API_EXPR_REF(msg->msg.bc.ipaddr));
break;
#endif /* LWIP_RAW */
#if LWIP_UDP
case NETCONN_UDP:
msg->err = udp_connect(msg->conn->pcb.udp, API_EXPR_REF(msg->msg.bc.ipaddr), msg->msg.bc.port);
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case NETCONN_TCP:
/* Prevent connect while doing any other action. */
if (msg->conn->state != NETCONN_NONE) {
msg->err = ERR_ISCONN;
} else {
setup_tcp(msg->conn);
msg->err = tcp_connect(msg->conn->pcb.tcp, API_EXPR_REF(msg->msg.bc.ipaddr),
msg->msg.bc.port, lwip_netconn_do_connected);
if (msg->err == ERR_OK) {
u8_t non_blocking = netconn_is_nonblocking(msg->conn);
msg->conn->state = NETCONN_CONNECT;
SET_NONBLOCKING_CONNECT(msg->conn, non_blocking);
if (non_blocking) {
msg->err = ERR_INPROGRESS;
} else {
msg->conn->current_msg = msg;
/* sys_sem_signal() is called from lwip_netconn_do_connected (or err_tcp()),
* when the connection is established! */
return;
}
}
}
/* For TCP, netconn_connect() calls tcpip_apimsg(), so signal op_completed here. */
sys_sem_signal(&msg->conn->op_completed);
return;
#endif /* LWIP_TCP */
default:
LWIP_ERROR("Invalid netconn type", 0, do{ msg->err = ERR_VAL; }while(0));
break;
}
}
/* For all other protocols, netconn_connect() calls TCPIP_APIMSG(),
so use TCPIP_APIMSG_ACK() here. */
TCPIP_APIMSG_ACK(msg);
}
/**
* Connect a pcb contained inside a netconn
* Only used for UDP netconns.
* Called from netconn_disconnect.
*
* @param msg the api_msg_msg pointing to the connection to disconnect
*/
void
lwip_netconn_do_disconnect(struct api_msg_msg *msg)
{
#if LWIP_UDP
if (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_UDP) {
udp_disconnect(msg->conn->pcb.udp);
msg->err = ERR_OK;
} else
#endif /* LWIP_UDP */
{
msg->err = ERR_VAL;
}
TCPIP_APIMSG_ACK(msg);
}
#if LWIP_TCP
/**
* Set a TCP pcb contained in a netconn into listen mode
* Called from netconn_listen.
*
* @param msg the api_msg_msg pointing to the connection
*/
void
lwip_netconn_do_listen(struct api_msg_msg *msg)
{
if (ERR_IS_FATAL(msg->conn->last_err)) {
msg->err = msg->conn->last_err;
} else {
msg->err = ERR_CONN;
if (msg->conn->pcb.tcp != NULL) {
if (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_TCP) {
if (msg->conn->state == NETCONN_NONE) {
struct tcp_pcb* lpcb;
#if LWIP_IPV6
if ((msg->conn->flags & NETCONN_FLAG_IPV6_V6ONLY) == 0) {
#if TCP_LISTEN_BACKLOG
lpcb = tcp_listen_dual_with_backlog(msg->conn->pcb.tcp, msg->msg.lb.backlog);
#else /* TCP_LISTEN_BACKLOG */
lpcb = tcp_listen_dual(msg->conn->pcb.tcp);
#endif /* TCP_LISTEN_BACKLOG */
} else
#endif /* LWIP_IPV6 */
{
#if TCP_LISTEN_BACKLOG
lpcb = tcp_listen_with_backlog(msg->conn->pcb.tcp, msg->msg.lb.backlog);
#else /* TCP_LISTEN_BACKLOG */
lpcb = tcp_listen(msg->conn->pcb.tcp);
#endif /* TCP_LISTEN_BACKLOG */
}
if (lpcb == NULL) {
/* in this case, the old pcb is still allocated */
msg->err = ERR_MEM;
} else {
/* delete the recvmbox and allocate the acceptmbox */
if (sys_mbox_valid(&msg->conn->recvmbox)) {
/** @todo: should we drain the recvmbox here? */
sys_mbox_free(&msg->conn->recvmbox);
sys_mbox_set_invalid(&msg->conn->recvmbox);
}
msg->err = ERR_OK;
if (!sys_mbox_valid(&msg->conn->acceptmbox)) {
msg->err = sys_mbox_new(&msg->conn->acceptmbox, DEFAULT_ACCEPTMBOX_SIZE);
}
if (msg->err == ERR_OK) {
msg->conn->state = NETCONN_LISTEN;
msg->conn->pcb.tcp = lpcb;
tcp_arg(msg->conn->pcb.tcp, msg->conn);
tcp_accept(msg->conn->pcb.tcp, accept_function);
} else {
/* since the old pcb is already deallocated, free lpcb now */
tcp_close(lpcb);
msg->conn->pcb.tcp = NULL;
}
}
}
} else {
msg->err = ERR_ARG;
}
}
}
TCPIP_APIMSG_ACK(msg);
}
#endif /* LWIP_TCP */
/**
* Send some data on a RAW or UDP pcb contained in a netconn
* Called from netconn_send
*
* @param msg the api_msg_msg pointing to the connection
*/
void
lwip_netconn_do_send(struct api_msg_msg *msg)
{
if (ERR_IS_FATAL(msg->conn->last_err)) {
msg->err = msg->conn->last_err;
} else {
msg->err = ERR_CONN;
if (msg->conn->pcb.tcp != NULL) {
switch (NETCONNTYPE_GROUP(msg->conn->type)) {
#if LWIP_RAW
case NETCONN_RAW:
if (ipX_addr_isany(PCB_ISIPV6(msg->conn->pcb.ip), &msg->msg.b->addr)) {
msg->err = raw_send(msg->conn->pcb.raw, msg->msg.b->p);
} else {
msg->err = raw_sendto(msg->conn->pcb.raw, msg->msg.b->p, ipX_2_ip(&msg->msg.b->addr));
}
break;
#endif
#if LWIP_UDP
case NETCONN_UDP:
#if LWIP_CHECKSUM_ON_COPY
if (ipX_addr_isany(PCB_ISIPV6(msg->conn->pcb.ip), &msg->msg.b->addr)) {
msg->err = udp_send_chksum(msg->conn->pcb.udp, msg->msg.b->p,
msg->msg.b->flags & NETBUF_FLAG_CHKSUM, msg->msg.b->toport_chksum);
} else {
msg->err = udp_sendto_chksum(msg->conn->pcb.udp, msg->msg.b->p,
ipX_2_ip(&msg->msg.b->addr), msg->msg.b->port,
msg->msg.b->flags & NETBUF_FLAG_CHKSUM, msg->msg.b->toport_chksum);
}
#else /* LWIP_CHECKSUM_ON_COPY */
if (ipX_addr_isany(PCB_ISIPV6(msg->conn->pcb.ip), &msg->msg.b->addr)) {
msg->err = udp_send(msg->conn->pcb.udp, msg->msg.b->p);
} else {
msg->err = udp_sendto(msg->conn->pcb.udp, msg->msg.b->p, ipX_2_ip(&msg->msg.b->addr), msg->msg.b->port);
}
#endif /* LWIP_CHECKSUM_ON_COPY */
break;
#endif /* LWIP_UDP */
default:
break;
}
}
}
TCPIP_APIMSG_ACK(msg);
}
#if LWIP_TCP
/**
* Indicate data has been received from a TCP pcb contained in a netconn
* Called from netconn_recv
*
* @param msg the api_msg_msg pointing to the connection
*/
void
lwip_netconn_do_recv(struct api_msg_msg *msg)
{
msg->err = ERR_OK;
if (msg->conn->pcb.tcp != NULL) {
if (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_TCP) {
#if TCP_LISTEN_BACKLOG
if (msg->conn->pcb.tcp->state == LISTEN) {
tcp_accepted(msg->conn->pcb.tcp);
} else
#endif /* TCP_LISTEN_BACKLOG */
{
u32_t remaining = msg->msg.r.len;
do {
u16_t recved = (remaining > 0xffff) ? 0xffff : (u16_t)remaining;
tcp_recved(msg->conn->pcb.tcp, recved);
remaining -= recved;
}while(remaining != 0);
}
}
}
TCPIP_APIMSG_ACK(msg);
}
/**
* See if more data needs to be written from a previous call to netconn_write.
* Called initially from lwip_netconn_do_write. If the first call can't send all data
* (because of low memory or empty send-buffer), this function is called again
* from sent_tcp() or poll_tcp() to send more data. If all data is sent, the
* blocking application thread (waiting in netconn_write) is released.
*
* @param conn netconn (that is currently in state NETCONN_WRITE) to process
* @return ERR_OK
* ERR_MEM if LWIP_TCPIP_CORE_LOCKING=1 and sending hasn't yet finished
*/
static err_t
lwip_netconn_do_writemore(struct netconn *conn)
{
err_t err;
void *dataptr;
u16_t len, available;
u8_t write_finished = 0;
size_t diff;
u8_t dontblock = netconn_is_nonblocking(conn) ||
(conn->current_msg->msg.w.apiflags & NETCONN_DONTBLOCK);
u8_t apiflags = conn->current_msg->msg.w.apiflags;
LWIP_ASSERT("conn != NULL", conn != NULL);
LWIP_ASSERT("conn->state == NETCONN_WRITE", (conn->state == NETCONN_WRITE));
LWIP_ASSERT("conn->current_msg != NULL", conn->current_msg != NULL);
LWIP_ASSERT("conn->pcb.tcp != NULL", conn->pcb.tcp != NULL);
LWIP_ASSERT("conn->write_offset < conn->current_msg->msg.w.len",
conn->write_offset < conn->current_msg->msg.w.len);
#if LWIP_SO_SNDTIMEO
if ((conn->send_timeout != 0) &&
((s32_t)(sys_now() - conn->current_msg->msg.w.time_started) >= conn->send_timeout)) {
write_finished = 1;
if (conn->write_offset == 0) {
/* nothing has been written */
err = ERR_WOULDBLOCK;
conn->current_msg->msg.w.len = 0;
} else {
/* partial write */
err = ERR_OK;
conn->current_msg->msg.w.len = conn->write_offset;
}
} else
#endif /* LWIP_SO_SNDTIMEO */
{
dataptr = (u8_t*)conn->current_msg->msg.w.dataptr + conn->write_offset;
diff = conn->current_msg->msg.w.len - conn->write_offset;
if (diff > 0xffffUL) { /* max_u16_t */
len = 0xffff;
#if LWIP_TCPIP_CORE_LOCKING
conn->flags |= NETCONN_FLAG_WRITE_DELAYED;
#endif
apiflags |= TCP_WRITE_FLAG_MORE;
} else {
len = (u16_t)diff;
}
available = tcp_sndbuf(conn->pcb.tcp);
if (available < len) {
/* don't try to write more than sendbuf */
len = available;
if (dontblock){
if (!len) {
err = ERR_WOULDBLOCK;
goto err_mem;
}
} else {
#if LWIP_TCPIP_CORE_LOCKING
conn->flags |= NETCONN_FLAG_WRITE_DELAYED;
#endif
apiflags |= TCP_WRITE_FLAG_MORE;
}
}
LWIP_ASSERT("lwip_netconn_do_writemore: invalid length!", ((conn->write_offset + len) <= conn->current_msg->msg.w.len));
err = tcp_write(conn->pcb.tcp, dataptr, len, apiflags);
/* if OK or memory error, check available space */
if ((err == ERR_OK) || (err == ERR_MEM)) {
err_mem:
if (dontblock && (len < conn->current_msg->msg.w.len)) {
/* non-blocking write did not write everything: mark the pcb non-writable
and let poll_tcp check writable space to mark the pcb writable again */
API_EVENT(conn, NETCONN_EVT_SENDMINUS, len);
conn->flags |= NETCONN_FLAG_CHECK_WRITESPACE;
} else if ((tcp_sndbuf(conn->pcb.tcp) <= TCP_SNDLOWAT) ||
(tcp_sndqueuelen(conn->pcb.tcp) >= TCP_SNDQUEUELOWAT)) {
/* The queued byte- or pbuf-count exceeds the configured low-water limit,
let select mark this pcb as non-writable. */
API_EVENT(conn, NETCONN_EVT_SENDMINUS, len);
}
}
if (err == ERR_OK) {
conn->write_offset += len;
if ((conn->write_offset == conn->current_msg->msg.w.len) || dontblock) {
/* return sent length */
conn->current_msg->msg.w.len = conn->write_offset;
/* everything was written */
write_finished = 1;
conn->write_offset = 0;
}
tcp_output(conn->pcb.tcp);
} else if ((err == ERR_MEM) && !dontblock) {
/* If ERR_MEM, we wait for sent_tcp or poll_tcp to be called
we do NOT return to the application thread, since ERR_MEM is
only a temporary error! */
/* tcp_write returned ERR_MEM, try tcp_output anyway */
tcp_output(conn->pcb.tcp);
#if LWIP_TCPIP_CORE_LOCKING
conn->flags |= NETCONN_FLAG_WRITE_DELAYED;
#endif
} else {
/* On errors != ERR_MEM, we don't try writing any more but return
the error to the application thread. */
write_finished = 1;
conn->current_msg->msg.w.len = 0;
}
}
if (write_finished) {
/* everything was written: set back connection state
and back to application task */
conn->current_msg->err = err;
conn->current_msg = NULL;
conn->state = NETCONN_NONE;
#if LWIP_TCPIP_CORE_LOCKING
if ((conn->flags & NETCONN_FLAG_WRITE_DELAYED) != 0)
#endif
{
sys_sem_signal(&conn->op_completed);
}
}
#if LWIP_TCPIP_CORE_LOCKING
else
return ERR_MEM;
#endif
return ERR_OK;
}
#endif /* LWIP_TCP */
/**
* Send some data on a TCP pcb contained in a netconn
* Called from netconn_write
*
* @param msg the api_msg_msg pointing to the connection
*/
void
lwip_netconn_do_write(struct api_msg_msg *msg)
{
if (ERR_IS_FATAL(msg->conn->last_err)) {
msg->err = msg->conn->last_err;
} else {
if (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_TCP) {
#if LWIP_TCP
if (msg->conn->state != NETCONN_NONE) {
/* netconn is connecting, closing or in blocking write */
msg->err = ERR_INPROGRESS;
} else if (msg->conn->pcb.tcp != NULL) {
msg->conn->state = NETCONN_WRITE;
/* set all the variables used by lwip_netconn_do_writemore */
LWIP_ASSERT("already writing or closing", msg->conn->current_msg == NULL &&
msg->conn->write_offset == 0);
LWIP_ASSERT("msg->msg.w.len != 0", msg->msg.w.len != 0);
msg->conn->current_msg = msg;
msg->conn->write_offset = 0;
#if LWIP_TCPIP_CORE_LOCKING
msg->conn->flags &= ~NETCONN_FLAG_WRITE_DELAYED;
if (lwip_netconn_do_writemore(msg->conn) != ERR_OK) {
LWIP_ASSERT("state!", msg->conn->state == NETCONN_WRITE);
UNLOCK_TCPIP_CORE();
sys_arch_sem_wait(&msg->conn->op_completed, 0);
LOCK_TCPIP_CORE();
LWIP_ASSERT("state!", msg->conn->state == NETCONN_NONE);
}
#else /* LWIP_TCPIP_CORE_LOCKING */
lwip_netconn_do_writemore(msg->conn);
#endif /* LWIP_TCPIP_CORE_LOCKING */
/* for both cases: if lwip_netconn_do_writemore was called, don't ACK the APIMSG
since lwip_netconn_do_writemore ACKs it! */
return;
} else {
msg->err = ERR_CONN;
}
#else /* LWIP_TCP */
msg->err = ERR_VAL;
#endif /* LWIP_TCP */
#if (LWIP_UDP || LWIP_RAW)
} else {
msg->err = ERR_VAL;
#endif /* (LWIP_UDP || LWIP_RAW) */
}
}
TCPIP_APIMSG_ACK(msg);
}
/**
* Return a connection's local or remote address
* Called from netconn_getaddr
*
* @param msg the api_msg_msg pointing to the connection
*/
void
lwip_netconn_do_getaddr(struct api_msg_msg *msg)
{
if (msg->conn->pcb.ip != NULL) {
if (msg->msg.ad.local) {
ipX_addr_copy(PCB_ISIPV6(msg->conn->pcb.ip), API_EXPR_DEREF(msg->msg.ad.ipaddr),
msg->conn->pcb.ip->local_ip);
} else {
ipX_addr_copy(PCB_ISIPV6(msg->conn->pcb.ip), API_EXPR_DEREF(msg->msg.ad.ipaddr),
msg->conn->pcb.ip->remote_ip);
}
msg->err = ERR_OK;
switch (NETCONNTYPE_GROUP(msg->conn->type)) {
#if LWIP_RAW
case NETCONN_RAW:
if (msg->msg.ad.local) {
API_EXPR_DEREF(msg->msg.ad.port) = msg->conn->pcb.raw->protocol;
} else {
/* return an error as connecting is only a helper for upper layers */
msg->err = ERR_CONN;
}
break;
#endif /* LWIP_RAW */
#if LWIP_UDP
case NETCONN_UDP:
if (msg->msg.ad.local) {
API_EXPR_DEREF(msg->msg.ad.port) = msg->conn->pcb.udp->local_port;
} else {
if ((msg->conn->pcb.udp->flags & UDP_FLAGS_CONNECTED) == 0) {
msg->err = ERR_CONN;
} else {
API_EXPR_DEREF(msg->msg.ad.port) = msg->conn->pcb.udp->remote_port;
}
}
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case NETCONN_TCP:
API_EXPR_DEREF(msg->msg.ad.port) = (msg->msg.ad.local?msg->conn->pcb.tcp->local_port:msg->conn->pcb.tcp->remote_port);
break;
#endif /* LWIP_TCP */
default:
LWIP_ASSERT("invalid netconn_type", 0);
break;
}
} else {
msg->err = ERR_CONN;
}
TCPIP_APIMSG_ACK(msg);
}
/**
* Close a TCP pcb contained in a netconn
* Called from netconn_close
*
* @param msg the api_msg_msg pointing to the connection
*/
void
lwip_netconn_do_close(struct api_msg_msg *msg)
{
#if LWIP_TCP
/* @todo: abort running write/connect? */
if ((msg->conn->state != NETCONN_NONE) && (msg->conn->state != NETCONN_LISTEN)) {
/* this only happens for TCP netconns */
LWIP_ASSERT("NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_TCP",
NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_TCP);
msg->err = ERR_INPROGRESS;
} else if ((msg->conn->pcb.tcp != NULL) && (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_TCP)) {
if ((msg->msg.sd.shut != NETCONN_SHUT_RDWR) && (msg->conn->state == NETCONN_LISTEN)) {
/* LISTEN doesn't support half shutdown */
msg->err = ERR_CONN;
} else {
if (msg->msg.sd.shut & NETCONN_SHUT_RD) {
/* Drain and delete mboxes */
netconn_drain(msg->conn);
}
LWIP_ASSERT("already writing or closing", msg->conn->current_msg == NULL &&
msg->conn->write_offset == 0);
msg->conn->state = NETCONN_CLOSE;
msg->conn->current_msg = msg;
lwip_netconn_do_close_internal(msg->conn);
/* for tcp netconns, lwip_netconn_do_close_internal ACKs the message */
return;
}
} else
#endif /* LWIP_TCP */
{
msg->err = ERR_VAL;
}
sys_sem_signal(&msg->conn->op_completed);
}
#if LWIP_IGMP || (LWIP_IPV6 && LWIP_IPV6_MLD)
/**
* Join multicast groups for UDP netconns.
* Called from netconn_join_leave_group
*
* @param msg the api_msg_msg pointing to the connection
*/
void
lwip_netconn_do_join_leave_group(struct api_msg_msg *msg)
{
if (ERR_IS_FATAL(msg->conn->last_err)) {
msg->err = msg->conn->last_err;
} else {
if (msg->conn->pcb.tcp != NULL) {
if (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_UDP) {
#if LWIP_UDP
#if LWIP_IPV6 && LWIP_IPV6_MLD
if (PCB_ISIPV6(msg->conn->pcb.udp)) {
if (msg->msg.jl.join_or_leave == NETCONN_JOIN) {
msg->err = mld6_joingroup(ipX_2_ip6(API_EXPR_REF(msg->msg.jl.netif_addr)),
ipX_2_ip6(API_EXPR_REF(msg->msg.jl.multiaddr)));
} else {
msg->err = mld6_leavegroup(ipX_2_ip6(API_EXPR_REF(msg->msg.jl.netif_addr)),
ipX_2_ip6(API_EXPR_REF(msg->msg.jl.multiaddr)));
}
}
else
#endif /* LWIP_IPV6 && LWIP_IPV6_MLD */
{
#if LWIP_IGMP
if (msg->msg.jl.join_or_leave == NETCONN_JOIN) {
msg->err = igmp_joingroup(ipX_2_ip(API_EXPR_REF(msg->msg.jl.netif_addr)),
ipX_2_ip(API_EXPR_REF(msg->msg.jl.multiaddr)));
} else {
msg->err = igmp_leavegroup(ipX_2_ip(API_EXPR_REF(msg->msg.jl.netif_addr)),
ipX_2_ip(API_EXPR_REF(msg->msg.jl.multiaddr)));
}
#endif /* LWIP_IGMP */
}
#endif /* LWIP_UDP */
#if (LWIP_TCP || LWIP_RAW)
} else {
msg->err = ERR_VAL;
#endif /* (LWIP_TCP || LWIP_RAW) */
}
} else {
msg->err = ERR_CONN;
}
}
TCPIP_APIMSG_ACK(msg);
}
#endif /* LWIP_IGMP || (LWIP_IPV6 && LWIP_IPV6_MLD) */
#if LWIP_DNS
/**
* Callback function that is called when DNS name is resolved
* (or on timeout). A waiting application thread is waked up by
* signaling the semaphore.
*/
static void
lwip_netconn_do_dns_found(const char *name, ip_addr_t *ipaddr, void *arg)
{
struct dns_api_msg *msg = (struct dns_api_msg*)arg;
LWIP_ASSERT("DNS response for wrong host name", strcmp(msg->name, name) == 0);
LWIP_UNUSED_ARG(name);
if (ipaddr == NULL) {
/* timeout or memory error */
API_EXPR_DEREF(msg->err) = ERR_VAL;
} else {
/* address was resolved */
API_EXPR_DEREF(msg->err) = ERR_OK;
API_EXPR_DEREF(msg->addr) = *ipaddr;
}
/* wake up the application task waiting in netconn_gethostbyname */
sys_sem_signal(API_EXPR_REF(msg->sem));
}
/**
* Execute a DNS query
* Called from netconn_gethostbyname
*
* @param arg the dns_api_msg pointing to the query
*/
void
lwip_netconn_do_gethostbyname(void *arg)
{
struct dns_api_msg *msg = (struct dns_api_msg*)arg;
API_EXPR_DEREF(msg->err) = dns_gethostbyname(msg->name, API_EXPR_REF(msg->addr), lwip_netconn_do_dns_found, msg);
if (API_EXPR_DEREF(msg->err) != ERR_INPROGRESS) {
/* on error or immediate success, wake up the application
* task waiting in netconn_gethostbyname */
sys_sem_signal(API_EXPR_REF(msg->sem));
}
}
#endif /* LWIP_DNS */
#endif /* LWIP_NETCONN */
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